A KIT FOR CASSETTES FOR DRAWER CABINETS AND A CASSETTE FOR A DRAWER CABINET

Abstract: A kit for cassettes for a drawer cabinet comprises two pairs or guide rails (28, 28'; 29, 29') which are provided as supplements and are mountable when so required. A first U-shaped rail (28, 28') is connectable at a rear end with the cassette (1), in the area of the rear wall (10) of the latter, and at a front end with the frontal frame (6) of the cassette. At its front end, the first rail has a roller (34) located at a level beneath the lower one (31) of two U-forming flanges. A second rail (29, 29') is at opposed, front and rear ends connectable to a side part (25, 25') of the drawer (5) comprised in the cassette. This rail has on one hand a longitudinal, projecting flange (37) arranged to abut against the roller (34) of the first rail, and on the other hand a roller (40) at its rear end arranged to engage between the flanges (31, 31') of the U-rail. A cassette for a drawer cabinet comprises similarly designed pairs of guide rails.

Description: A KIT FOR CASSETTES FOR DRAWER CABINETS AND A CASSETTE FOR A DRAWER CABINET- Technical Fif.1 nf t-.hs Tπvpnl-.inn The present invention relates to a kit for cassettes intended for the construction of drawer cabinets, each of which cassettes accomodates a drawer and comprises on one hand a rectangular frontal frame from which four walls extend, viz. a bottom wall, two side walls and an upper wall, and on the other hand a rear wall to which said walls are connected, and which frontal frame has substantially vertically positioned flanges in connection with the first mentioned walls, the drawer in addition to a frontal part comprising a bottom part, two side parts and a rear par . Prior Art A cassette for a drawer cabinet of the sort generally described above is previously known from DE-A-3 905 843. In its basic embodiment, the individual cassette is provided with four male-like members on its underside, in the form of hook-shaped plates or sheet portions intended to be inserted and locked in cooperating holes in the upper side of a subjacent casette. The cassettes are commercially available in different embodiments, in particular in embodiments with different heights, thereby enabling the user to erect drawer cabinets adapted to individual needs in a quick and flexible way. In the known cassette for drawer cabinets, the drawer is normally arranged to be guided by two guide rails which are placed on both sides of the drawer adjacent to on one hand each side wall and on the other hand to the bottom wall. According to this embodiment, the drawer is retained in its position within the cassette by two projecting members which are formed on the underside of the bottom part of the drawer, in the vicinity of the frontal part of the drawer, in order to be locked behind a lower part of the frontal frame of the cassette as long as the drawer rests upon the cooperating guide rails. Only when lifting the frontal end of the drawer, so that the projecting members pass clear of the lower part of the frontal frame, the drawer can be pulled out in a direction out of the cassette. In its maximally pulled-out position, the drawer is retained in the cassette by an upper edge portion of the rear part of the drawer that engages behind an upper part comprised in the frontal frame of the cassette. For a complete removal of the drawer from the cassette, the frontal portion of the drawer is turned in an upward direction when the drawer is in the region of its maximally pulled-out position. Further, Fig. 19 to 21 in DE-A-3 905 843 illustrate a special embodiment according to which an individual selected cassette may be supplemented by a special kit including rolls in order to simplify the pulling out and the pushing in of the drawer relative to the cassette. This kit comprises on one hand two analogous, although mirror-inverted runway tracks which are mountable in the space between an individual side wall of the cassette and a fixed guide rail located at a distance from the inside of said wall, and on the other hand an angle-shaped corner shoe which on its outside carries a rotatable pulley or roller and which is intended to be placed on the outside of each rear corner of the drawer. More precisely, the corner shoe is formed in such a way that it may be applied on a rear corner of the drawer while the drawer is in the cassette, viz . in a half pulled out position, the shoe being held in its position after application of a screw which is insertable from the inside via a hole in a side piece of the drawer. The fact that the drawer is still in the cassette when the roller-bearing corner shoe is fastened on the drawer is an absolute condition for this construction at all being capable of being used, since the roller after having been mounted will protrude to a certain degree from the adjacent side part of the drawer; a fact making it impossible for the roller to pass past the frontal frame of the cassette. An advantage of this embodiment is that the drawer of the particular drawer cabinet becomes smoothly movable when pulling it in or pushing it out also in case the drawer contains heavy objects. However, an important disadvantage of the kit as shown in Fig. 19 to 21 in DE-A-3 905 843 is that it requires a demounting of the cassettes in an existing drawer cabinet in that the corner shoes provided with rollers may only be inserted through the hole present in the upper wall of the cassette. In practice, such a demounting of the cassettes is very cumbersome to accomplish since the drawer cabinets cooperate intimately with other components, such as side-arranged drawer cabinets and/or cassettes as well as superjacent work benches. Objects and Features of the Invention The present invention aims at eliminating the above- mentioned disadvantage of the previously known construction and in a first aspect at creating a kit which in combination with suitable modifications of the cassette per se makes possible a later inclusion of pulleys or rollers for facilitating the movements of the drawer in a cassette without any necessity of removing the latter from an existing, already built-up drawer cabinet. Thus, a primary object of the present invention is to enable a later mounting of such rollers by simple means which may be applied in the cassette and on the drawer, respectively, when the drawer is removed from the cassette. According to the invention, at least its primary object is attained by the features defined in the characterizing clause of claim 1. In a second aspect, the invention foresees a drawer cabinet cassette per se comprising a drawer. The features of this cassette are defined in claim 2. Further elucidation of the prior art CH 441 655 discloses a guide rail arrangement using two pairs of cooperating rails, each pair comprising a fixed rail having a first roller as well as a displacable or movable rail having a second roller. The fixed roller of this arrangement is, however, located with its upper half at a level above the lower flange of the fixed rail, and furthermore the centre axis of the movable roller is situated approximately level with an upper flange of the movable rail. This means that the upwardly protruding fixed roller makes it impossible to insert the movable roller linearly in the guide formed by the two spaced- apart flanges of the fixed rail. Therefore, the arrangement cannot be used for cassettes of the type to which the invention relates. Brief Description of the Attached Drawings In the drawings: FIG. 1 is a simplified perspective view illustrating a drawer cabinet in a first embodiment, built up of several cassettes containing . drawers, FIG. 2 is an analogous perspective view showing another embodiment of such a drawer cabinet, FIG. 3 a perspective view of an individual cassette with the appurtenant drawer shown in a pushed- in position, FIG. 4 is a perspective exploded view with the drawer separate from the cassette and with a number of the guide rails included in the kit according to the invention, said rails being shown in connection with the drawer, FIG. 5 is a perspective view of the cassette with the drawer fully pulled out, FIG. 6 is a perspective view of the cassette illustrated from below, and FIG. 7 is a partial, enlarged perspective view showing the interior of the cassette. In figure 1 reference numeral 1 designates individual cassettes which are stacked into a drawer cabinet which is designated by 2 in its entirety. As may be seen in figure 2, the lowermost cassette 1 may be mounted on a special bottom frame 3 which is suited for being connected to the underlying floor or support. The uppermost cassette of the drawer cabinet may be covered by a special cover plate 4 or by a longer table which may be supported on two or several drawer cabinets (not shown) . In figures 3 and 4, reference numeral 5 generally designates the drawer that is included in each cassette 1. The cassette 1 as such is composed of a frontal frame, in its entirety designated 6, which delimits a frontal opening 7 for the reception of drawer 5, and a rear part, in its entirety designated 8. This rear part comprises two side walls 9, 9' and a rear wall 10. In practice, the rear part 8 may be made of one single continuous, suitably thin-walled piece of sheet-metal which is punched out of a material and is bent into a U-shape as seen in a cross-section as well as in contour. More precisely, by this shape both upper horizontal flanges 11 and lower, equally horizontal flanges 12 (see figure 6) are formed along each one of walls 9, 9' and 10. Said upper flanges 11 are situated in a common plane and form an upper wall or part of the cassette 1. In an analogous way, also the lower flanges 12 are situated in a common horizontal plane and form a lower wall or part of the cassette. The free ends of the U-profiles that are formed by side walls 9, 9 1 embrace the frontal frame 6 and are connected to it in a suitable manner, for instance by spot welding or pressing. Advantageously, also frontal frame 6 is made of thin sheet-metal which is given a U-shaped cross-section by punching and bending. In figure 4 reference numeral 13 designates an upper part, 14 a bottom part and 15,15' vertical side parts included in said frontal frame. Each one of these four front parts 13, 14, 15 and 15' comprises a vertically positioned flange 16. Along the lower flanges 12 of the side walls 9,9' sheet-metal plates 17 of L-formed cross-section are arranged which form fixed guide rails of standard character for the drawer 5. Thus, in its standard embodiment drawer 5 is movable forwardly and backwardly along guide rails 17 while being guided by the vertical flanges 18 of the guide rails. Further, in figures 3 to 6 may be seen that the bottom side of each cassette is provided with four male-like projections 19 in the form of hook-shaped sheet-metal tabs which can be brought into engagement with corresponding, elongate holes 20 in the upper flanges 11 of a subjacent cassette. When male projections 19 have been brought into engagement with holes 20 and two connected cassettes have been placed so that they are located in register with each other in one and the same vertical plane, then the cassettes may be locked relative to each other by locking a member 21 in the form of a thread-like finger whose free end may be brought into engagement with an analogous hole 22 via an elongate hole in the horizontal web of frontal bottom part 14, hole 22 being in the horizontal web of the frontal upper part in each subjacent cassette. Any horizontal dislocation of the cassettes relative to each other is impeded by locking finger 21, thus safely joining the cassettes and forming a form-stable drawer cabinet. Referring to figure 4, it should be noted that drawer 5 in addition to a frontal part which is designated 23 in its r- r- f. <Λ O ■ t r- β\ β o ON W IΛ f- ro IΛ ©\ 0

Claims: f- s W H υ IΛ • t- ro IΛ o addition to a frontal frame (23) comprising a bottom part (24), two side parts (25, 25') and a rear part (26) , c h a r a c t e ¬ r i z e d in that the cassette comprises two pairs of guide rails (28, 28'; 29, 29') , each pair having a first rail (28, 28') with a substantially U-shaped cross-section which at a rear end is connected to the cassette (1) in the vicinity of the rear wall (10) of the latter and at a front end is connected to the cassette in the vicinity of the frontal frame (6) and with the front end of which is connected a rotatable pulley or roller (34) located at a level beneath the lower one (31) of two U- forming flanges (31, 31') of the rail, and a second rail (29, 29') which at opposed, front and rear ends is connected to a side part (25, 25') of the drawer (5) and which on one hand has a longitudinal projecting flange (37) arranged to abut against the roller (34) of the first rail (28, 28') , and on the other hand a rotatable pulley or roller (40) located at its rear end and arranged at a level above said flange (37) to engage between the U-forming flanges (31, 31') of the first rail. 3. Cassette according to claim 2, c h a r a c t e¬ r i z e d in that a tab (42) is punched out and bent-in in each vertically positioned side flange (15, 15') comprised by the frontal frame (6) , in which tab there is a hole arranged to receive a hook (35) on the outside of the web (30) of the first • guide rail (28, 28') , and that said tab (42) extends rearwardly from a cut-in portion (41) in the side flange (15, 15') of the frontal frame, the form and size of which cut-in portion substantially corresponding to the cross-sectional form and size of the first guide rail.

Inventors: FORSGREN STELLAN, FORSGREN, STELLAN
Applicants: BORGSTROEMS PLAATINDUSTRI AB, FORSGREN STELLAN, FORSGREN, STELLAN
Application year: 1994
Main classification: A47B88
IPC codes: A47B88